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Squeezing and entanglement without infinite-range interactions

Event Dates:

Seminar Location:

JILA Auditorium

Speaker Name(s):

Michael Foss-Feig

Speaker Affiliation(s):

Joint Quantum Institute

Seminar Type/Subject

Scientific Seminar Type:

AMO Seminar

Event Details & Abstract:

It is well known that the application of infinite-range interactions can generate massively entangled states with applications in quantum information and quantum metrology. Combining recent exact solutions with a controlled perturbative calculation in the inverse system size, we analytically determine the spin-squeezing in Ising models with power-law (1/r^alpha) decaying interactions in D dimensions, thus extending the understanding of spin-squeezing into a much broader and experimentally relevant context. When interactions are not infinitely long-ranged, the spin squeezing is generally modified by both a lack of translational invariance and by a departure from collective (i.e. within the Dicke manifold) dynamics. In the large system limit, the former effect destroys squeezing for /any/ power law. On the other hand, remarkably, the departure from collective dynamics has /no/ effect on squeezing in the large system limit for sufficiently long-range interactions (alpha<2D/3).

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